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Boston Marathon bombing suspect Dzhokhar Tsarnaev told authorities that he and his brother Tamerlan built the bombs using instructions from al Qaeda's online magazine, and that they originally intended to detonate them at Boston's July 4 celebration. The brothers had also viewed Internet sermons by slain al Qaeda propagandist Anwar al Awlaki. The FBI recently sent more investigators to Russia to help with the case. A Pentagon report said North Korea's continuing development of its nuclear technology and long-range missiles may enable it to ultimately strike the US with an atomic weapon.